If the PXIe-5622 IF digitizer module fails to phase-lock to the PXIe-5652 LO source module internal reference through the front panel, complete the following steps:
  1. Verify that the cable is not faulty and that all cables are connected to the correct terminals.
  2. Verify that there is a reference signal generated from the PXIe-5652REF IN/OUT front panel connector.
    If there is a frequency reference signal coming from the PXIe-5652REF IN/OUT front panel connector, the PXIe-5622 phase-lock circuitry may be at fault.
If failures continue and there is no signal at these output terminals, there may be a problem with the PXIe-5652 hardware. Contact NI technical support or visit ni.com/support.